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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47bbfaa88f4cab24c48d91a2f5ec2b9ec0108345f369913f5f6b3abdf9a1d66' 
  AND token = 'ValDZhnK1O3tOUBUy4BPej9u5CxOIhUGl95/4s9086w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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