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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042d48ee5960bb9ec0732a2903d4b3696bab77a4d1ea04355b33204dd42ffe2b' 
  AND token = 'Xr5teG8phb+A6BVDlzMbW6Th+ZUBFRg3KguU+4FAZ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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