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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e968cc34a017da6e8ab1c53fbf2ceb4e456852fc60b2061e2bf2a31843af9ee8' 
  AND token = 's/pcZcdd24JQE2bLKHdGgeejdaDOOM+2u4zpYWMPEDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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