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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b1fb9351fc448e276d0606375bd0e96a72777733369585919229672c517136' 
  AND token = 'e82NxVRRENqcSHPahaUX6tJQfxTLfcKTrPuUQea3CA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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