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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0738599b12730fbb780ea8cd0d1000a6dc4f0779226296c188aef99046fb385' 
  AND token = 's02QjveE1VhogukJ4sqe9fvBEVJW8XZJMC3NX+qDng0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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