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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0a26a1f684ec9f3ce1c1f6c131463439ed66658de80b35ee9d66c8343e4a35' 
  AND token = '09mrFFL8trDg9O2NDbwvYltO5IjPE/7VrMltIRZDQxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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