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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ef23a24f17f01a5d98a7beb818003f68cc9d6bc86a370e876351433d549cdb' 
  AND token = 'EH0ITvgsu7d5THWIjFHLOKef6tiI1xyzVYq94Ru3h+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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