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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3442bb1a2ecc7dcfa706eb0269bea8d53917c56ac43a1f9de716aff0d49adcf' 
  AND token = '/swX56wdU0XSt2KxcUlBOGZAhOH0lBpmHr84B2g3eeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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