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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb58530afdbc3bb6712252b6b142ca0d828ff916217ef4dabd3716d1095f84ac' 
  AND token = 'uTumGFltnEWKXyfeY8FzsIWUZbev3EVZ1Cja4G+m0aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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