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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86bd5bd361ed5234ed45101774c4a8b5d3c9c620eb3855bcf4338d7dc57d35c' 
  AND token = '8/YBVd5BgAD+w5gZVPvOZMAH3YNPr0C9s3tkFDa+EP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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