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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee088e310f3ad57174e9bd2df5702aedd11408ad5bec3a2e4034c031c40f1b2e' 
  AND token = '4d6v6hnU0hRaRjDYJu5W6h4iHkxLNGu7/ZxZqNNnQt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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