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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02fbd9e3ad0c96ecf4c05246c2cca9cdfd7f19fac68be3e3b74e3ae863f6d4f' 
  AND token = 'Cx1vLk68+I2VQHl/Pwv9THRtdv6GondMq4bRcXcOOOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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