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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fdb9b3ea494b6115e54d007695d05baa5ce61a5880b11724b2dd590756b2ec' 
  AND token = 'w+yMD2riml5RAUv/VBisPhc4LA38HZqSixZaK3CrpLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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