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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969d9b422585050b000facf4bc6ddae2a26b72b4ac0dc9b1c4040ca072631f20' 
  AND token = 'X4wxZMs8kLOtkDTGuJ/Ahv0q/u48Y1/xUL5PiAakzAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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