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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372956c061070b722e70063440c1e91fc1532d6175596b7b8c22da8e80dd4afc' 
  AND token = 'ZLxKwhBs8y6gc8vBpx8fiAnHlyU1UedF7aJp3Lam4sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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