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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ec8adc73a058d48c29edb328519928f9e3cd39d01303edbe715b410c19fc4a' 
  AND token = 'AKaNi+f7kb5xQohcW+Mi76ePbqQlIzECUR0OiUu6gjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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