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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3ebddfe63285c5df8e7c528324b3e0ddb31f2867373247a170e8de991fec0b' 
  AND token = 'H/0hkQfkTEgc4r5x+ck+NaRvskCPyiJM5iD7C77GT0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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