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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947549f720780f37137993b5fa50925fd2efad4f28ae70c1fb516247f0372e95' 
  AND token = 'U8Hgfs5Tf8a6wwuxP+60gzjJkLjxuFfWpub2/H+cHqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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