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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1aab42328b1141c6b15def80bc4efdf610b9e392f846cf3a92d5a61a4ac0d4' 
  AND token = '/tswGcXkjN0bwLuWmqbgy4iRePTmFMD2EoQ8lv6qoFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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