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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06ab5ca14bf0dca2cd31b83b564d4b7b73c6840de7a0be8b008376e589b3cda' 
  AND token = '5ymyQRNuxVpvKyp3F0soVx+ZvHDYc0aTMhacL4GonWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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