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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ee15d3b35c029d447836fc456ef4afa289970bc3451907bd7bfbff51434d87' 
  AND token = '7iNZg2ibk4U0fLrYjChu+TjH3N2acYUjYLk/jweADa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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