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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9403f483eacc3cc889e23d1ca2eca17911bab5be8317e9422d9e6e02598716d5' 
  AND token = 'zsgbM6QvfTCJXI6MLE4hf2RBo0t1ARC15bMC12h05rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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