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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3ba175e9e7b36e379dffe5de28a47e1743eed6331aaeee1e23745e367cffb9' 
  AND token = 'ovqG7iFS2bukxOjwnwc3Dwrs1+sYot58oprPPkaxq2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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