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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bdb43a7b58da8639b49cf0d9792bea36d4409cb41baa2744daf4c412ed5267' 
  AND token = '9JbZmm5g7pT7dL+h9pVCEXc86wxwFO7qnFGrZJtWqNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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