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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa51e9f38aa563b23fc7471fef89e150569506b5de73dd577ab1e74deb550326' 
  AND token = 'iozB8cMEuJuzYZgzl1OrP7oK9VNJVrtdzaiv51mDVvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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