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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf227c605073cf41bb5bb6b836d57cfc387fa96fa0e7b8853c1fed535d2c91f0' 
  AND token = '6gMRtyjk606iiiLSkXP0E/8o1rt3dQKwaP5q2JCcn+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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