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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ee92c14235b908cd19e9b0ab6a1943687f7c268f372b1eaa25da0b0e0cf9f8' 
  AND token = 'hGKZr9o3t2azYp3l/8hvKtdzzget2iVAVJvoy2U4yK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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