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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba18201ef372cd0192178153b296734cb957ba7868f2bb6e9511ac0d3550c3f8' 
  AND token = 'vlaboqhFrS9x5MC64s4ntAfA7nygVAuCWZWV4NFiXmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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