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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b815945260091bbd943819bf27610cd6b68fca1b70752b05c7f899a42d75f0b3' 
  AND token = 'tbnpdxokX0uHbiJDdHao4V9bDdP4S4nmhvCQSf0/Cv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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