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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb558232058329d6bd4af2996f10d18880befd305af62241f6184a615bfac1b' 
  AND token = '2tvyoD5LBiM/pziQM2iAelIv6e/T27NaLtsLZE5kbEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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