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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad74623a46a87f8b3a0c40c83840a62215cffd99f704a09dbbb53583b7e35a6' 
  AND token = 'fgga+F0wzkiZVvhrhQaFXA5NtZizS5FLeywbWX+Fdgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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