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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96e36fb37d655489db684f6eeabdcb91f69837e9c08485a6daacfe8e3547b0a' 
  AND token = 'BpclTgKyREqHIgDy2DFGwObwg1vv5xxh6+iWpSlC7hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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