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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe591029d4623d68304354e4c3b8b0fe68da8030f7e645c723793b2bc778051' 
  AND token = '+C75ClVaMuojzbu3rXsx149vRZqs7fw2ROyAYfb6ZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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