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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6726381addf8ee6f23ae28442f07461090bee34af2680d16ad78609bec4664e4' 
  AND token = 'FFxsT4WoZADDBvGTxfUwpCkRyv1i2Uwugp0SqasgxhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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