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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc9d4ef5f39271b901d28855026137646ec257db8791bd12ff9cde0ca48da3b' 
  AND token = 'j3GRetO++sc2ve3P+GlKI8ebuz4uIAgXzkYF34j24Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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