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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0b4928f2ddc4c01c59bfe93f33f6bcbddf7fc3cf8a4247f25717f9ef35d5d7' 
  AND token = 'uRz8/UpU+nuyZ7AjybPVjmb5Mr6jqPdpco4HQ/Xk8Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}