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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfcf4517717e03254e11a81ae2c10c9475280de937ee565c3e6d5db96647cd5' 
  AND token = 'SKIcKXcr80wakauYdk9pGAwN8vpHSnjHAvAqxoVoay8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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