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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ebdc658a8a1e2ebd80cb9a5385d3b5559fcc076fc7ee880d8c029372308e15' 
  AND token = 'lwp1mF3QbL4p2sq6MGfvLXDRB5JGtpOZqlkRXcvZzFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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