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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a16c732c09a65321132a4f951bb5564442fcbd8b866f3531555ba93b1b02ea7' 
  AND token = 'poBtIuToUv5RL60Oj6cKolUjjMkPAVNpW2G8X8J9O6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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