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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeea5dcb8d3b75a04258e9383ac0d85f068a745cb9dc7f8dba7c6ad0140f7713' 
  AND token = '1dik/QihbZFMomA684wW+VJpSyqtQjSAlyX9beWIuY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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