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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218dadf46c74f6007ce5cb698431a5ade4f657878132caacc5f59d419c94986b' 
  AND token = 'pCe4ms90sM3wSUkWwH1lFbTANNA3rdwegO+t5ctgnTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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