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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a007f42d39a4e896ff88f575676b68e8cea375cd923ebfc173dd777df446216' 
  AND token = 'uFo3QKMLwSI3D3t2JqGoDnwwZG5f1i++XN240BN8DNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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