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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d60220d90326e0855ddf4e7706e66cf4dc1b5d0ed04bce9e253af7c0b6e836' 
  AND token = 'OPBBKsPDScvtb8OWP0Uqry0lrjekwny1MKJv2Fa/qmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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