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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469c890598afe28f078c7d6b2e50e0e445da2d107b947207417eefac78a295c4' 
  AND token = 'DQBN81D8qPO3TUWHhSHEKJ7+FA6bho17pbkfIyNEsIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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