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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac476cf72757e60bf7315a34bee25b13696f233617e9bd3fbaac77e9d0a25570' 
  AND token = 's+UjK76FbNmBmkoubgNdweExfUdp4eG6t3ePbu3lWDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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