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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e154028d99ec2c8b77dffccd3be9fb8d624bc230f56e1a825938fe5e116bd6e' 
  AND token = '6Naz/+GOAGI2uBs9pydpr/sZ3nsSEr2gpHdM6n8jv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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