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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecbd33aecabf51d31606377b46e266d8942204532d135180d632f7ba33c666c' 
  AND token = 'nVSACfVTShLScPqd0LDu+UZrRsFrg3rgu8q6QHPuGlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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