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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919a6339240e102d31bf59f4e5730e59456fe88829795e5648a15989eb0c266c' 
  AND token = 'fBz6C8jjlNxdRKrN5PnMsUL6r0OuAvVMSuvKJWJ29e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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