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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7e094367c1b7ba9278df1aa699e73697e308783202b9efb2e1d0c85c597abe' 
  AND token = 'rXCglJkM32rKVa65g99NPDJziEu0T1klO6AuDCv9bEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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