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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43afa2c97b19158b83106ac896c7a1e20beea93fe8ea570c5be039c852f2e372' 
  AND token = 'SpJrzjF9cHG1TEJWoWU3YbG+v7gvdpySYCQOzPOr8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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