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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b784596c733f110e2d70b489b3cd78945e59b0b6a31c9bf9f3ee7c0601a6bb93' 
  AND token = 'MilEdwSjVoxRpFaar6WYCUgrFXOzt2OLIwa1jFBBb0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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